Processing Motion results for use in a vibro-acoustic response

You can use the Model and Load Pre-processing solution process to transform Motion results into Simcenter Nastran frequency-dependent acoustic loads for use in vibro-acoustic response solutions in both the FEM and BEM acoustic environments. You convert the Motion results to binary HDF5 (.sc_h5) format.

You can initiate the Model and Load Pre-processing solution process from Pre/Post or Motion. For Motion users, initiating the process from Motion is quicker because you can perform the pre-processing without switching applications and creating a new solution.

For example, you can transform the time-domain results of a Motion simulation of a multi-body model with a gearbox containing gears created in the Motion Transmission Builder to the frequency domain. You can then use the transformed frequency results as structural excitations at force locations in a Simcenter Nastran vibro-acoustic force response simulation.

Frequency post-processing of time-domain results		Vibro-acoustic forced response simulation using ATV		Structural and acoustic post-processing

For more information about using the Model and Load Pre-processing solution process with other types of files and operations, see Model and Load Pre-processing solution process.

Supported file types

You can transform the following types of Motion results:

• Simcenter 3D Motion (.mres)

• LMS Virtual.Lab Motion (.LMSMotionResults)

Selection recipes

To map the loads in the motion input file to target nodes in the vibro-acoustic model mesh, you use the Create Selection Recipes command, which automatically creates selection recipes of the locations of the loads. The selection recipes appear in the Selection Recipe container in the Simulation Navigator. You can visualize the selection recipes as you do any selection recipe.

For example, the following shows the selection recipes that match the center nodes of the RBE2 spiders that distribute the forces on the housing of the gearbox.

The automatic creation of selection recipes is based on the connection tables available in the motion result files. If no motion connectivity table is available, you can create the selection recipes manually for each motion function.

For more information about selection recipes, see Selection recipes.

Transforming time-domain results to frequency

Two operations are available to transform motion time-domain results to frequency:

• Time Signal Processing

• Time to Waterfall of Time

For information about these operations, see Transforming time-domain to frequency.

You can also perform other operations on motion results. For more information about the available operations, see Model and Load Pre-processing solution process.

Solving the solution process

After you specify the input file, create the selection recipes, and define the processing, you use the Solve command to solve the solution process. The results of the solve are HDF5 file with the results as well as supporting files. For more information about the files, see Files created during the solve.

Applying the results as acoustical loads

You extract the forces stored in the HDF5 result file as load recipes. For Motion results, the following data types are used for load recipes:

• Forces

• Displacements (translational)

• Velocities

• Accelerations

To set up the mapping of the loads to target nodes, you use the selection recipes you created from the input file. You set the Strategy option in the Autofill Options tab of the Load Recipe dialog box to Selection recipe based.

You can also import or export the mapping tables to and from a CVS file. You can use a spreadsheet editor to edit the mapping manually or delete mappings.

For more information about load recipes, see Load recipes.

You can visualize the data from a load recipe using scenario-based post-processing. The data in your load recipe determines which scenarios are available. For more information, see Post processing with preconfigured views.

Vibro-acoustic solution from the load recipes

After you create load recipes, you can then use the New Solution From Load Recipe command to create a vibro-acoustic response solution.

Acoustic FEM environment

• SOL 108 Direct Frequency Response

• SOL 108 Vibro-Acoustic Transfer Vector Response

• SOL 111 Modal Frequency Response

Acoustic BEM environment

• Indirect Vibro-Acoustic

The command creates the steps and load boundary conditions appropriate for the selected solution type.

For more information about creating solutions from load recipes, see Create a solution from a load recipe.

Where do I find it?

Application	Pre/Post
Prerequisites	A Simulation file as the work part and displayed partSimcenter Nastran or Simcenter 3D Acoustics BEM as the specified solverFor Simcenter Nastran, Vibro-Acoustic as the specified analysis typeSOL 108 Direct Frequency ResponseSOL 108 Vibro-Acoustic Transfer Vector ResponseSOL 111 Modal Frequency ResponseFor Simcenter 3D Acoustics BEM, Indirect Vibro-Acoustic as the specified analysis typeMotion results
Simulation Navigator	Right-click a Simulation file→New Solution Process→Model and Load Pre-Processing

How do I

Transform Motion result files for use in vibro-acoustic response

Learn more

Motion translate workflow in Pre/Post for vibro-acoustic loading

Motion MPF transform workflow for vibro-acoustic loading

Transforming time-domain to frequency

Quick links

Command reference

Pre/Post video examples

Bulk Entry Descriptions

Simcenter 3D tutorials

Browse Simcenter 3D help by product area

Processing Motion results for use in a vibro-acoustic response, Simcenter 3D 2021.1 Series

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